David carter



" UNITED STATES PATENT OFFICE.

DAVID CARTER, OF STIRCHLEY, ENGLAND.

VALVE FOR ROTARY JENGI'NES.

SPECIFICATION forming part of Letters Patent No. 654,227, dated July 24, 1900.

Application filed March 6,1900. S rial N 7,604. .110 model.)

To aZZ whono it may concern:

Be it known that I, DAVID CARTER, engi= neer, a subject of the Queen of Great Britain, residing at 6 Ashtree road, Stirchley, near Birmingham, England, have invented certain new and useful Improvements in Valves for Rotary Engines, of which the following is a specification.

This invention relates to rotary engines of that class in which two cylinders on parallel shafts are geared together, the cirou rnference of one cylinder being in contact with the other for the greater part of their revolution and in which one cylinder has a radial piston extending from it at one part of its circumference and the other (which forms a rotating abutment) has a recess in its circumference which allows the piston to pass as the cylinders revolve and in which also a cylindrical casing surrounds the rotating cylinders, the piston on the one cylinder fitting to the interior of one portion ofthe casing and the re mainder of the casing fitting around the cylindrical abutment. According to this inven tion two such engines are formed together end to end. The cylinders which carry the pistonsare u pon one shaft,which extends through both. The cylindrical abutments are upon another shaft, which also extends through both, and the piston of one division of the englue is set on the opposite side of the shaft to the piston of the other division, so that when one piston is passing the abutment which works with it the other has upon it a full pressure of steam.

For admitting steam to and allowing it to pass from the annular space around which the radial piston of each division travels two passages are formed, opening into the annular space of that division on either side of and close to the abutment. The passages lead to a directing or reversing valve by which steam can be supplied to either passage, while the other is opened to the exhaust, according to the direction in which the engine is to be driven. Steam is supplied to this directingvalve through a second cylindrical valve, which is geared to and revolves with the other revolving shafts and is so formed as to cut off the steam-supply to either division of the engine at the time when the radial piston of that division is passing the abutment which works with it. One reversing-valve and one rotating cut-off valve serve for both divisions of the engine. The cut-off valve is cylindrical and hollow. A port-ion of its circumference is exposed to steam in a steam-space along one side of it. It hastwo opposite ports in its sides, one near each end. Steam passes to the interior of the valve through one of the ports in its side and through the other port.

passesto one or otherend ofthe directingorreversing valve, to be directed by it eiI her to the channel leading to one side of the abutment or the other of one of the divisions. larly when the cut-off valve has made a halfturn steam is directed to the other division. Thedirecting or reversing valve is also cy- 'lindrical and hollow with ports in its side and inclined partitions by which when the valve is turned into one position steam is directed to one or other of the channels leading to the annular channels, while the other is opened to the exhaust; Similar cut-off and directing or reversing valves can be' used with unduplicated single engines.

The above improvements are shown in the drawings annexed.

Figure 1 is a side elevation of the engine. Fig. 2 is a vertical transverse section through one division of the engine. Fig. 3 is a horizontal section through the valves. Fig. 4 is a modification of the engine, in which the two valves are placed one above the other i place of side by side. a

A A are two cylinders on a shaft A Each cylinder carries a radial piston A the piston carried by the cylinder A being on the opposite side of the shaft to the piston carriedby the cylinder A. l

B B are the cylindrical abutments on the shaft B C is a casing inclosing the piston-carrying cylinder and cylindrical abutment of each di vision of the engine.

D is the reversing-valve, and E the continuously-revolving valve for controlling the admission of steam first to one division of the engine and then to the other. The spindle of this valve and the shafts A B are all geared together by gear-wheels F, so that they revolve at the same speed.

G G are passages leading from opposite sides of the casing of the valve D to the in- Patented July 24, I900.

N. A. CHRISTENSEN.

VALVE GEAR FOR ENGINES.

Ap lication filed Nov. 21, 1398.

3 Sheets-Sheet I.

(No Model.)

I. h N 

